Features ■ ■ ■ ■ Applications Thick film technology Bourns patented thermal fuse Fail safe Protection to ITU-T K.20 ■ ■ ■ ■ ■ ■ Analog Line Cards CPE (Customer Premises Equipment) DDS (Digital Data Systems) DLC (Digital Loop Carriers) T1/T3 Transmission Lines ISDN L21 Line Feed Resistors w/Thermal Fuse Product Characteristics Resistor Tolerance 20 ohms to 100 ohms .....................................................±1 % 5.6 ohms .........................................................................±5 % Ratio Tolerance 20 ohms to 100 ohms ..................................................±0.5 % 5.6 ohms ......................................................................±2.5 % Operating Temperature.......................................-40 °C to +85 °C Environmental Characteristics TESTS PER MIL-STD-202 Humidity ..........................................................................103B Solderability.....................................................................208D Thermal Shock ................................................................107B Resistance to Solvents ......................................................215 Resistance to Solder Heat ..............................................210D Flammability ...................................................................UL 94V-0 IEC 695-2-2 Circuit Schematic R1 R2 F2 F1 1 2 6 4 MAX. SEATED HEIGHT 12.32 (0.485) 25.75 MAX. (1.010) 0.84 REF. (.033) 2.54 (.100) 5.08 (.200) TYP. 3 PLCS. 2.54 (.100) TYP. 2 PLCS. 3.18 MAX. THICKNESS (.125) How To Order L21 A100AA 9 Product Dimensions Functional Characteristics ITU-T K.20 Lightning Surge ................................................................1 KV Power Induction........................................................600 Vrms Power Contact..........................................................230 Vrms UL 497A Physical Characteristics Body Style ..........................................................Open Frame SIP Body Material...........................................................96% Alumina Lead Frame Material..................................Copper, solder coated Standard Parts Available Off the Shelf ........................................................5.6, 20, 30, 50, 100 ohms 8 DIMENSIONS: 3.175 + 0.64/-0.13 (.125 + .025/-.005) 0.51 ±0.25 THICK (.020 x .010) 0.81 DIA. HOLE (.032) MM (INCHES) Model (L21 = LFR w/Thermal Fuse) Resistor Tolerance • A5R6AA = 5.6 ohms • A020AA = 20 ohms • A030AA = 30 ohms • A050AA = 50 ohms • A100AA = 100 ohms Custom values available; contact factory. Circuit Protection Division Asia-Pacific: Tel: +886-2 2562-4117 Fax: +886-2 2562-4116 Europe: Tel: +41-41 768 5555 Fax: +41-41 768 5510 The Americas: Tel: +1-951 781-5500 Fax: +1-951 781-5700 www.bourns.com REV. A 06/05 Specifications are subject to change without notice. Customers should verify device performance in their specific applications.